Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Atoms in Strong Fields I
A 34.7: Vortrag
Freitag, 10. März 2017, 12:45–13:00, N 2
Intense-field S-Matrix formalism with coulomb interaction applied to ATI — •Willi Paufler1, Birger Böning1, and Stephan Fritzsche1,2 — 1Friedrich-Schiller-Universität, Jena, Germany — 2Helmholtz-Institut Jena, Germany
The commonly used Strong-Field Approximation is a powerful tool to study the interaction of few cycle laser pulses with atoms. SFA provides a good insight in many strong-field effects like Above-Threshold Ionization (ATI), Higher Harmonics Generation and Non Sequential Double Ionization. If the SFA is applied to ATI processes, we neglect the influence of the parent ion on the photoelectron and describe it as a free electron in presence of just the laser field. This simplification causes heavy problems in the Low-Energy Structures (LES) and the Keldysh approximation fails to describe this part of the spectrum. We investigate the Strong-field S-Matrix formalism using the continuum Coulomb waves augmented with the time-dependent Volkov phase [1] and compare the calculations with the results of the SFA and TDSE calculations.
[1] Faisal, F. H. M., Phys. Rev. A94, 031401 (2016)